<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react资料_stu//依赖包/react.development.js"></script>
    <script src="../react资料_stu//依赖包/react-dom.development.js"></script>
    <script src="../react资料_stu//依赖包/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        /* 
      当表单的value受state控制，则我们称作为受控表单
        - 受控表单三种用法
          1. 表单的初始值受控 直接书写defaultValue属性
          2. 表单是只读表单(设置了readOnly={true}) 直接设置value也是可以的
          3. 数据双向绑定:表单通过value受控,然后需要绑定onChange事件,事件中获取当前表单的值修改state
    
    */
   class App extends React.Component{
    state={
        name:'laowang',
        age:18,
        hobby:'吃饭'
    }
    render(){
        const {name,age,hobby}=this.state
        return(
            <div>
            姓名: <input type="text" defaultValue={name}/> 
            <br/>
            年龄: <input type="text" value={age}/> 
            <br/>
            爱好: <input type="text" value={hobby}/> 
            <br/>
            <button onClick={this.handle}>提交</button>
                </div>
        )
    }
    handle = () => {
         
        }
   }
   ReactDOM.createRoot(document.getElementById('app')).render(<App/>)
    </script>
</body>
</html>